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Add #[must_use] to remaining std functions (A-N)

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This commit is contained in:
John Kugelman
2021-10-30 22:58:27 -04:00
parent e249ce6b23
commit e129d49f88
18 changed files with 68 additions and 14 deletions
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3
library/std/src/io/util.rs
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@@ -32,6 +32,7 @@ pub struct Empty;
/// io::empty().read_to_string(&mut buffer).unwrap();
/// assert!(buffer.is_empty());
/// ```
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_io_structs", issue = "78812")]
pub const fn empty() -> Empty {
@@ -112,6 +113,7 @@ pub struct Repeat {
/// io::repeat(0b101).read_exact(&mut buffer).unwrap();
/// assert_eq!(buffer, [0b101, 0b101, 0b101]);
/// ```
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_io_structs", issue = "78812")]
pub const fn repeat(byte: u8) -> Repeat {
@@ -192,6 +194,7 @@ pub struct Sink;
/// let num_bytes = io::sink().write(&buffer).unwrap();
/// assert_eq!(num_bytes, 5);
/// ```
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_io_structs", issue = "78812")]
pub const fn sink() -> Sink {